Lesson 12 Homework 3 7
A STORY OF UNITS
Name
Date
1. Measure and label the side lengths of the shapes below in centimeters. Then, find the perimeter of each
shape.
b.
a.
Perimeter = _____+_____+_____
Perimeter = _____________________
= _______ cm
= _______ cm
c.
d.
Perimeter = _____________________
Perimeter = _____________________
= _______ cm
= _______ cm
e.
Perimeter = _____________________
= _______ cm
Lesson 12:
© 2014 Common Core, Inc. All rights reserved. commoncore.org
Measure side lengths in whole number units to determine the
perimeter of polygons.
59
Lesson 12 Homework 3 7
A STORY OF UNITS
2. Melinda draws two trapezoids to create the hexagon shown below. Use a ruler to find the side lengths of
Melinda’s hexagon in centimeters. Then, find the perimeter.
3. Victoria and Eric draw the shapes shown below. Eric says his shape has a greater perimeter because it
has more sides than Victoria’s shape. Is Eric right? Explain your answer.
Victoria’s Shape
Eric’s Shape
4. Jamal uses his ruler and a right angle tool to draw the rectangle shown below. He says the perimeter of
his rectangle is 32 centimeters. Do you agree with Jamal? Why or why not?
Lesson 12:
© 2014 Common Core, Inc. All rights reserved. commoncore.org
Measure side lengths in whole number units to determine the
perimeter of polygons.
60